His first tweet -- especially notable because he didn't use Twitter handlers as many celebrities and figureheads have -- has been retweeted more than 44,000 times and it's been favorited nearly 15,000 times.

But one tweet wasn't enough for Pope Benedict XVI. He's stayed busy on Twitter, sending out six more tweets since his first one. More impressively, he's sent those tweets using TweetDeck -- an app typically used by heavy Twitter users.